cc : Move LayerImpl::parent to test properties

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 0c3975d353afe61779925a90fcafa2364c95f475..803e528d6538b006093b32a6a7baeef4306db9fb 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -102,10 +102,8 @@ class CC_EXPORT LayerImpl {
   bool IsActive() const;
 
   // Tree structure.
-  LayerImpl* parent() { return parent_; }
   void AddChild(std::unique_ptr<LayerImpl> child);
   std::unique_ptr<LayerImpl> RemoveChildForTesting(LayerImpl* child);
-  void SetParent(LayerImpl* parent);
 
   void DistributeScroll(ScrollState* scroll_state);
   void ApplyScroll(ScrollState* scroll_state);
@@ -516,9 +514,6 @@ class CC_EXPORT LayerImpl {
 
   virtual const char* LayerTypeAsString() const;
 
-  // Properties internal to LayerImpl
-  LayerImpl* parent_;
-
   int layer_id_;
   LayerTreeImpl* layer_tree_impl_;